Nothing -- the empty class

Types of Nothing :

• InexactNumber'

Functions and methods returning an object of class Nothing :

• addCancelTask(Task,Task) -- specify that the completion of one task triggers the cancellation of another
• addDependencyTask(Task,Task) -- schedule a task, but ensure that it will not run until another task finishes
• addStartTask(Task,Task) -- schedule a task upon completion of another
• cancelTask(Task) -- stop a task
• echoOff(File) -- see echoOff -- turn off echoing
• echoOn(File) -- see echoOn -- turn on echoing
• kill(File) -- see kill -- kill a process
• kill(ZZ) -- kill a process
• linkFile(String,String) -- make a new link to a file
• remove(Database,String) -- see remove -- remove an entry from a mutable hash table, list, or database
• remove(HashTable,Thing) -- see remove -- remove an entry from a mutable hash table, list, or database
• remove(MutableList,ZZ) -- see remove -- remove an entry from a mutable hash table, list, or database
• scan(BasicList,BasicList,Function) -- see scan -- apply a function to each element in a list or sequence
• scan(BasicList,Function) -- see scan -- apply a function to each element in a list or sequence
• scan(Thing,Function) -- see scan -- apply a function to each element in a list or sequence
• scan(ZZ,Function) -- see scan -- apply a function to each element in a list or sequence
• scanPairs(HashTable,Function) -- see scanPairs -- apply a function to the pairs in a hash table

Methods that use an object of class Nothing :

• Nothing == Nothing -- see == -- equality
• concatenate(Nothing) -- see concatenate -- join strings
• Nothing << Manipulator -- see File << Thing -- print to a file
• Nothing << Thing -- see File << Thing -- print to a file
• getWWW(String,Nothing) -- see getWWW -- get a web page
• inducedMap(Module,Nothing,Matrix) -- see inducedMap(Module,Module,Matrix) -- compute the induced map
• inducedMap(Nothing,Module,Matrix) -- see inducedMap(Module,Module,Matrix) -- compute the induced map
• inducedMap(Nothing,Nothing,Matrix) -- see inducedMap(Module,Module,Matrix) -- compute the induced map
• inducesWellDefinedMap(Module,Nothing,Matrix) -- see inducesWellDefinedMap -- whether a map is well defined
• inducesWellDefinedMap(Nothing,Module,Matrix) -- see inducesWellDefinedMap -- whether a map is well defined
• inducesWellDefinedMap(Nothing,Nothing,Matrix) -- see inducesWellDefinedMap -- whether a map is well defined
• info(Nothing) (missing documentation)
• locate(Nothing) -- see locate -- locate source code
• Manipulator Nothing -- see Manipulator -- the class of all file manipulators
• map(Module,Nothing,RingMap,List) -- see map(Module,Module,RingMap,Matrix) -- homomorphism of modules over different rings
• map(Module,Nothing,RingMap,Matrix) -- see map(Module,Module,RingMap,Matrix) -- homomorphism of modules over different rings
• map(Module,Nothing,List) -- create a matrix by giving a doubly nested list of ring elements
• map(Module,Nothing,Matrix) -- recast a matrix to have a new target, and a free module as source
• modulo(Matrix,Nothing) -- see modulo(Matrix,Matrix) -- find the pre-image (pullback) of image of a map (low level version)
• modulo(Nothing,Matrix) -- see modulo(Matrix,Matrix) -- find the pre-image (pullback) of image of a map (low level version)
• package(Nothing) -- see package -- get containing package
• part(Nothing,Nothing,RingElement) -- see part -- select terms of a polynomial by degree(s) or weight(s)
• part(Nothing,Nothing,VisibleList,RingElement) -- see part -- select terms of a polynomial by degree(s) or weight(s)
• part(Nothing,ZZ,RingElement) -- see part -- select terms of a polynomial by degree(s) or weight(s)
• part(Nothing,ZZ,VisibleList,RingElement) -- see part -- select terms of a polynomial by degree(s) or weight(s)
• part(ZZ,Nothing,RingElement) -- see part -- select terms of a polynomial by degree(s) or weight(s)
• part(ZZ,Nothing,VisibleList,RingElement) -- see part -- select terms of a polynomial by degree(s) or weight(s)
• sublists(VisibleList,Function,Function,Nothing) -- see sublists -- process interspersed subsequences of a visible list
• sublists(VisibleList,Function,Nothing) -- see sublists -- process interspersed subsequences of a visible list
• sublists(VisibleList,Function,Nothing,Function) -- see sublists -- process interspersed subsequences of a visible list
• sublists(VisibleList,Function,Nothing,Nothing) -- see sublists -- process interspersed subsequences of a visible list
• submatrix'(Matrix,Nothing,Nothing) -- see submatrix' -- exclude rows and/or columns of a matrix
• submatrix'(Matrix,Nothing,VisibleList) -- see submatrix' -- exclude rows and/or columns of a matrix
• submatrix'(Matrix,VisibleList,Nothing) -- see submatrix' -- exclude rows and/or columns of a matrix
• subquotient(Matrix,Nothing) -- see subquotient -- make a subquotient module
• subquotient(Module,Matrix,Nothing) -- see subquotient -- make a subquotient module
• subquotient(Module,Nothing,Matrix) -- see subquotient -- make a subquotient module
• subquotient(Module,Nothing,Nothing) -- see subquotient -- make a subquotient module
• subquotient(Nothing,Matrix) -- see subquotient -- make a subquotient module
• symmetricAlgebra(Nothing,Nothing,Matrix) -- see symmetricAlgebra -- the symmetric algebra of a module
• symmetricAlgebra(Nothing,Ring,Matrix) -- see symmetricAlgebra -- the symmetric algebra of a module
• symmetricAlgebra(Ring,Nothing,Matrix) -- see symmetricAlgebra -- the symmetric algebra of a module
• urlEncode(Nothing) -- see urlEncode -- URL encoding

Fixed objects of class Nothing :

• null -- the unique member of the empty class

For the programmer

The object Nothing is a type, with ancestor class Thing.